EP3777114B1 - Production d'effet local à réglage dynamique - Google Patents

Production d'effet local à réglage dynamique Download PDF

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Publication number
EP3777114B1
EP3777114B1 EP19722730.9A EP19722730A EP3777114B1 EP 3777114 B1 EP3777114 B1 EP 3777114B1 EP 19722730 A EP19722730 A EP 19722730A EP 3777114 B1 EP3777114 B1 EP 3777114B1
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EP
European Patent Office
Prior art keywords
sidetone
generation circuit
control signal
determining
generating
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Active
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EP19722730.9A
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German (de)
English (en)
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EP3777114A1 (fr
Inventor
Xiang-Ern Yeo
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Bose Corp
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Bose Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • G10L21/0324—Details of processing therefor
    • G10L21/034—Automatic adjustment
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/78—Detection of presence or absence of voice signals
    • G10L25/84—Detection of presence or absence of voice signals for discriminating voice from noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H04M1/6041—Portable telephones adapted for handsfree use
    • H04M1/6058—Portable telephones adapted for handsfree use involving the use of a headset accessory device connected to the portable telephone
    • H04M1/6066—Portable telephones adapted for handsfree use involving the use of a headset accessory device connected to the portable telephone including a wireless connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1016—Earpieces of the intra-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
    • H04R2201/107—Monophonic and stereophonic headphones with microphone for two-way hands free communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/20—Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Definitions

  • This disclosure generally relates to headsets used for communications over a telecommunication system.
  • Headsets used for communicating over telecommunication systems include one or more microphones and speakers.
  • the speaker portion of such a headset can be enclosed in a housing that may cover a portion of one or both ears of the user, thereby interfering with the user's ability to hear his/her own voice during a conversation. This in turn can cause the conversation to sound unnatural to the user, and degrade the quality of user-experience of using the headset.
  • the present invention relates to a method and a headset according to the independent claims.
  • Advantageous embodiments are set forth in the dependent claims.
  • Sidetone generation is used for providing an audible feedback to a user of a communication headset that interferes with the user's ability to hear ambient sounds naturally. Naturalness of a conversation can be improved, for example, by detecting the user's own voice using a microphone, and playing it back as an audible feedback via a speaker of the communication headset. Such audible feedback is referred to as a sidetone.
  • Such acoustic devices can include, for example, wired or wireless-enabled headsets, headphones, earphones, earbuds, hearing aids, or other in-ear, on-ear, or around-ear acoustic devices.
  • a sidetone generator in a headset a user may not be able to hear ambient sounds, including his/her own voice while speaking, and therefore may find the experience to be unnatural or uncomfortable. This in turn can degrade the user experience associated with using headsets for conversations or announcements.
  • a sidetone generator may be used in a communication headset to restore, at least partially, the natural acoustic feeling of a conversation.
  • a sidetone generator can be used, for example, to provide to the user, through a speaker, acoustic feedback based on the user's own voice captured by a microphone. This may allow the user to hear his/her own voice even when the user's ear is at least partially covered by the headset, thereby making the conversation sound more natural to the user.
  • a sidetone may include undesirable artifacts that could potentially degrade the user-experience rather than making the experience sound natural.
  • a sidetone signal may cause a user to perceive such noise more prominently, thereby degrading the overall user-experience.
  • constant wideband noise includes noise emanated from a HVAC system of a building, noise from vehicular traffic in the vicinity, or babble noise at a public place such as a coffee shop.
  • a user may prefer to avoid hearing a sidetone signal altogether, or prefer a low gain to be associated with the sidetone signal.
  • a sidetone signal may generate undesirable artifacts even in the absence of wideband noise.
  • high frequency noise resulting from noise spikes or impulses can also affect sidetones and thereby degrade user-experience.
  • impulse noise include dropping of a metal object, noise caused by shuffling of papers, or noise caused by a metallic foil type material.
  • a sidetone generation circuit can cause such noise to be amplified and piped in to both ears of a user. This can result in the user not being able to adequately perceive the direction from which the noise emanates, and due to potential psychoacoustic effects on the user, the amplified impulse noise included in the sidetone signal for both ears can cause the noise to appear to be louder than the noise actually is.
  • the technology described herein provides a sidetone generation circuit that can be automatically adjusted based on the output of a voice activity detector (VAD) and/or a noise level estimator.
  • VAD voice activity detector
  • the adjustments may be made substantially without any real-time input from the user.
  • this allows for the sidetone generation circuit to be automatically disabled (or adjusted to a low-gain state) when no voice activity is detected and/or the wideband noise in the ambient is above a threshold level.
  • the technology described herein may reduce the chances of impulse noise spikes degrading the user-experience associated with sidetones.
  • the subject technology may prevent a high level of ambient noise from degrading the user-experience. In some cases, this can also improve battery life by reducing the amount of time a sidetone generation circuit operates at a high gain level.
  • FIG. 1 shows an example of a headset 100. While an in-ear headset is shown in the example, other acoustic devices such as wired or wireless-enabled headsets, headphones, earphones, earbuds, hearing aids, or other in-ear, on-ear, or around-ear acoustic devices are also within the scope of the technology described herein.
  • the example headset 100 includes an electronics module 105, an acoustic driver module 110, and an ear interface 115 that fits into the wearer's ear to retain the headset and couple the acoustic output of the driver module 110 to the user's ear canal.
  • an electronics module 105 includes an electronics module 105, an acoustic driver module 110, and an ear interface 115 that fits into the wearer's ear to retain the headset and couple the acoustic output of the driver module 110 to the user's ear canal.
  • the ear interface 115 includes an extension 120 that fits into the upper part of the wearer's concha to help retain the headset.
  • the extension 120 can include an outer arm or loop 125 and an inner arm or loop 130 configured to allow the extension 120 to engage with the concha.
  • the ear interface 115 may also include an ear-tip 135 for forming a sealing configuration between the ear interface and the opening of the ear canal of the user.
  • the headset 100 can be configured to connect to another device such as a phone, media player, or transceiver device via one or more connecting wires or cables (e.g., the cable 140 shown in FIG. 1 ).
  • the headset may be wireless, e.g., there may be no wire or cable that mechanically or electronically couples the earpiece to any other device.
  • the headset can include a wireless transceiver module capable of communicating with another device such as a mobile phone or transceiver device using, for example, a media access control (MAC) protocol such as Bluetooth ® , IEEE 802.11, or another local area network (LAN) or personal area network (PAN) protocol.
  • MAC media access control
  • LAN local area network
  • PAN personal area network
  • the headset 100 includes one or more microphones that capture the voice of a user and/or other ambient acoustic components such as noise, and produce corresponding electronic input signals.
  • the headset 100 can also include circuitry for processing the input signals for subsequent transmission out of the headset, and for generating sidetone signals based on the input signals.
  • FIG. 2 is a block diagram of circuitry 200 associated with a headset that includes a sidetone generation circuit in accordance with one implementation of the technology described herein.
  • the circuitry 200 includes a sidetone generator 205 that generates a sidetone based on input signals provided by a microphone 210.
  • a microphone 210 Even though the example of FIG. 2 shows a single microphone 210, two or more microphones may also be used without deviating from the scope of the technology described herein.
  • the sidetone signals generated by the sidetone generator 205 may be used to produce acoustic feedback via one or more acoustic transducers or speakers 215.
  • the operation of the sidetone generator 205 is dynamically affected by a voice activity detector (VAD) 220 and/or a noise level estimator (NLE) 225.
  • VAD voice activity detector
  • NLE noise level estimator
  • Such modules are configured to affect the operation of the sidetone generator 205 in various ways.
  • the VAD 220 and/or the NLE 225 are configured to communicate one or more control signals to the sidetone generator 205 to enable/disable the sidetone generator 205.
  • the VAD 220 and/or the NLE 225 can be configured to generate one or more control signals that adjust the gain of an output of the sidetone generator 205.
  • the one or more control signals generated by the VAD 220 and/or the NLE 225 can be configured to adjust a variable gain amplifier (VGA) 230 controlling the output of the sidetone generator 205.
  • VGA variable gain amplifier
  • the NLE 225 can be used, for example, to adjust sidetone gain, or even potentially disable the sidetone generator 205 if the ambient noise is above a threshold level.
  • the NLE 225 can be configured to estimate the level of wideband noise in audio signal captured by the microphone 210, and generate one or more control signals to adjust the gain of the VGA 230 and/or enable/disable the sidetone generator 205 in accordance with the estimated gain level.
  • the NLE 225 can be configured to access a storage device that stores sidetone gain levels usable for multiple corresponding levels of ambient noise, for example, in a look-up table representation.
  • the level of wideband noise in the audio signal can be estimated by estimating the root mean square (RMS) value of a filtered signal (e.g., a-weighted) with a time constant, and then applying a calibration constant to estimate the noise in dBSPL.
  • the gain levels corresponding to the different levels of ambient noise can be determined, for example, empirically, and/or based on user-inputs.
  • the user-input may specify gain limits for different levels of noise, and the NLE 225 may be configured to fine-tune the gain adjustments within such preset limits.
  • the user-input may be received, for example, via a user interface presented on a display device of a phone or other device connected to the headset.
  • the NLE can be configured to access such a representation of a look-up table, select a particular gain level associated with the estimated noise level, and generate a control signal that adjusts the gain of the VGA 230 to the particular gain level.
  • the NLE 225 can be configured to disable the sidetone generator 205 if the ambient noise level is higher than a threshold.
  • the NLE 225 can also be configured to enable the sidetone generator 205 responsive to determining that the ambient noise level is lower than the threshold.
  • the types of noise that may be estimated by the NLE 225 include, for example, white noise such as noise produced by a HVAC system, babble noise such as background noise present in a coffee shop or other public places, wind noise, traffic noise, etc.
  • sidetones may be affected by artifacts produced by non-wideband noise such as transient high frequency noise.
  • Transient high frequency noise may be problematic due to attendant psychoacoustic effects on the user of the headset, and the way such headsets process the noise.
  • the magnitude and frequency characteristics of a high-frequency noise spike may be perceived differently at the two ears, depending on, for example, the direction from which the noise emanates.
  • the user when a user is wearing a headset, the user expects such noise to be attenuated due to the passive attenuation provided by the headset.
  • noise spikes may be amplified by the sidetone generator 205, and piped or played through the acoustic transducers 215 at each ear with substantially equal volume. This may cause the noise to be perceived by the user at a level louder than he/she would have perceived it in the absence of the sidetone generator. Therefore, in some cases, a sidetone generator that does not use the subject technology may degrade the user-experience significantly, particularly when the user is not speaking and instead is trying to focus on far-end users' voices being played through the acoustic transducers of the headset.
  • the VAD 220 can be configured to adjust the VGA 230 such that the gain associated with the generated sidetone is maintained at a low level in the absence of detected speech.
  • the VAD 220 is also configured to adjust the VGA 230 to a high gain level responsive to detecting speech by the user of the headset and/or speech in the vicinity of the user of the headset. For example, if the user of the headset is the lone participant in a teleconference, the VAD 220 can be configured to adjust the gain of the VGA 230 based on detecting (or not detecting) speech of the user.
  • the VAD 220 can be configured to adjust the gain of the VGA 230 based on detecting (or not detecting) speech of the user, or generally speech emanating from sources in the vicinity of the user.
  • the VAD 220 may be configured to identify the voice of the particular user of the headset (e.g., via a learning process on frequency and/or magnitude characteristics of the user's voice) and configured to generate control signals responsive to detecting the voice of the particular user. This can also be used, for example, to personalize the sidetone generation for different users, for example, by allowing for user-preferences to control aspects of the sidetone generation process.
  • adjustments to the sidetone gain may substantially reduce artifacts associated with transient high-frequency noise by preventing amplification of such noise during periods when no speech is detected.
  • the VAD 220 can include one or more processing devices configured to execute a voice activity detection process on input audio data received from the microphone 210.
  • a voice activity detection process can be used to identify if there is human speech present in the input audio data, and generate a discrete flag that indicates the presence of such speech.
  • the VAD 220 can be configured to generate the one or more control signals (e.g., for controlling the VGA 230 or enabling/disabling the sidetone generator 205) in accordance with the presence or absence of the flag.
  • the VAD 220 can be configured to compute a score indicative of a probability of human speech being present in the input audio data, and the one or more control signals can be generated based on such a score.
  • the one or more control signal can be accordingly generated to adjust the VGA 230.
  • Various types of voice activity detection processes may be used in computing such soft-VAD scores.
  • One example of such a process is described in the reference: Huang, Liang-sheng and Chung-ho Yang. "A novel approach to robust speech endpoint detection in car environments.” Acoustics, Speech, and Signal Processing, 2000. ICASSP'00. Proceedings. 2000 IEEE International Conference on. Vol. 3. IEEE, 2000 .
  • FIG. 3 is a schematic diagram illustrating the process of adjusting the gain associated with a sidetone in accordance with the output of the VAD 220.
  • the VAD 220 processes the input audio data received from the microphone 210 to determine if speech is present in the input audio data (310). The determination can be done, for example, using a voice activity detection process such the ones described above. Based on the determination, the gain of the VGA 230 may be adjusted. When the gain level of the VGA 230 is adjusted between two or more levels (e.g., a high level representing a high gain for the sidetone and a low level representing a low gain for the sidetone), the switching may not be instantaneous, for example, due to characteristics of the associated circuit. Rather, the gain level of the VGA 230 may be ramped up or down between the two or more levels over a period of time (e.g., 500-1000 ms).
  • a period of time e.g. 500-1000 ms
  • the VAD 220 can be configured to determine whether the gain level of the VGA 230 is being ramped up (315). If it is determined that the gain of the VGA 230 is already being ramped up, the process can be continued (e.g., in accordance with the curve representing the ramp-up) until the target gain level associated with speech activity is reached (320).
  • the VAD 220 can be configured to generate a control signal that applies the target level to the VGA (325). In some implementations, this can include, for example, reversing or stopping a ramping down process, and initiating a ramp-up process to set the gain level to the target gain level associated with speech activity. In some implementations, this can also include allowing a ramp-down process to reach the destination level before initiating the ramp-up process. In some implementations, if the current gain level of the VGA 230 is already at the target level, the VAD 220 can be configured to maintain the current gain level.
  • the VAD 220 can be configured to determine whether the gain level of the VGA 230 is being ramped down (330). If it is determined that the gain of the VGA 230 is already being ramped down, the process can be continued (e.g., in accordance with the curve representing the ramp-down) until the target gain level associated with the absence of speech activity is reached (320). Conversely, if it is determined that the gain of the VGA 230 is not being ramped down and the current gain of the VGA 230 is above the target gain level associated with the absence of speech activity, the VAD 220 can be configured to generate a control signal that applies the corresponding target level to the VGA (335).
  • this can include, for example, reversing or stopping a ramping-up process, and initiating a ramp-down process to set the gain level to the target gain level associated with the absence of speech activity. In some implementations, this can also include allowing a ramp-up process to reach the destination level before initiating the ramp-down process. In some implementations, if the current gain level of the VGA 230 is already at the target level associated with an absence of speech activity, the VAD 220 can be configured to maintain the current gain level.
  • control signals from the VAD 220 and the NLE 225 may be weighted to control the gain associated with the sidetone generated by the sidetone generator 205. For example, if an output of the NLE 225 indicates that the ambient noise level is higher than a threshold level, the sidetone generator 205 may be operated at a low gain level (or deactivated) even if an output of the VAD 220 indicates the presence of speech activity. In some implementations, the sidetone generator 205 may be deactivated based on user-input that overrides the control signals. For example, the headset or a corresponding connected device (e.g., a phone) may include a control that allows the user to mute the microphone. The sidetone generator 205 may be deactivated automatically upon activation of such a control by the user.
  • a corresponding connected device e.g., a phone
  • the sidetone generator 205 and/or the circuitry 200 in general can include one or more different components.
  • the circuitry 200 may include one or more analog to digital converters (ADC) that digitize the analog signals captured by the microphone 210.
  • ADC analog to digital converters
  • the circuitry 200 can include a sample rate converter that converts the sample rate of the digitized signals to an appropriate rate.
  • outputs of the sample rate converter can be provided to circuitry within the sidetone generator 205, where such samples are processed to generate the sidetone signals.
  • the sidetone generator 205 can be configured to use various types of processing in generating the sidetone signal.
  • the sidetone generator can include one or more of: a beamformer, a microphone mixer, and an equalizer. If two or more microphones 210 are present, the beamformer can be configured to combine signals from the microphones to facilitate directional reception. This can be done, for example, using a time-domain beamforming technique such as delay-and-sum beamforming. In other implementations, frequency domain techniques such as a minimum variance distortionless response (MVDR) beamformer may be used.
  • MVDR minimum variance distortionless response
  • a mixer can be configured to combine the signals, for example, to increase (e.g., to maximize) the signal to noise ratio in the output signal.
  • the output of the mixer can be provided to an equalizer, which applies an equalization process on the mixer output to generate the output sidetone signal.
  • the equalization process can be configured to shape the sidetone signal such that any acoustic feedback generated based on the sidetone signal sounds natural to the user of the headset.
  • the sidetone signal can be mixed in with the incoming signal, and played back through the acoustic transducer or speaker 215 of the headset.
  • FIG. 4 is a flow chart of an example process 400 for generating a sidetone signal.
  • the process 400 can be executed on a headset, for example, in cooperation between the sidetone generator 205 and the VAD 220 described above with reference to FIG. 2 .
  • One or more processing devices associated with the VAD 220 are used to detect the presence or absence of voice activity, whereas one or more processing devices associated with the sidetone generator 205 are to generate a sidetone signal in accordance with an input received from the VAD 220.
  • Operations of the process 400 can include receiving an input signal representing ambient audio (410).
  • the input signal can include digitized audio data generated from audio captured using the microphone 210.
  • Operations of the process 400 further include determining that at least a portion of the input signal represents voice activity that satisfies a threshold condition (420).
  • the input signal may be processed at a VAD 220, which generates an output (e.g. a flag) indicative of speech activity being present in the input signal.
  • the threshold condition may be associated with the voice activity of the user of the headset.
  • the headset can be configured to learn the particular user's voice, and the threshold condition may be deemed to be satisfied if the particular user's voice is detected among speech activity of multiple users.
  • a particular user's voice may be learnt, for example, based on frequency and/or magnitude characteristics of that user's voice.
  • satisfying the threshold condition may constitute a determination that adequate speech activity is not present in the input signal.
  • the VAD 220 can be configured to generate an output indicative of an absence of adequate speech activity.
  • Operations of the process 400 also include generating, responsive to determining that the voice activity in the input signal satisfies the threshold condition, a control signal configured to cause the sidetone generation circuit to generate sidetone signals (430).
  • this can include determining that a gain associated with the sidetone generation circuit is below our target level, and in response to such determination, generating the control signal which adjusts the gain to a level above the target level. For example, if the gain associated with the sidetone generation circuit is originally at a low level, the gain may be set to a higher level upon detection of speech activity.
  • the sidetone generation circuit may initially be in a deactivated condition, and in response to detecting speech activity in the input signal, the VAD 220 may generate a control signal that's configured to activate/reactivate the sidetone generation circuit.
  • the control signal can be configured to reduce the gain associated with the sidetone, or deactivate the sidetone generation circuit.
  • generating the control signal can include determining that a gain associated with the sidetone generation circuit is larger than a corresponding target level, and in response, generating a control signal configured to reduce the gain to the corresponding target level.
  • generating the control signal can include determining that a gain associated with the sidetone generation circuit is larger than a target level, and in response, generating a control signal that is configured to prevent the gain from being reduced to a level lower than the target level. For example, if absence of voice activity is detected during a period when the gain is in a transient state of already being ramped down to a low level, the control signal may be configured to maintain the gain at the low level once that level is reached.
  • the control signal is generated in accordance with an estimated noise level in the ambient audio.
  • generating the control signal can include determining an estimated noise level in the ambient audio, and generating the control signal in accordance with the estimated noise level. This may be done, for example, by accessing a representation of a lookup table that associates multiple noise levels with corresponding gain levels, and selecting a particular gain level associated with the estimated noise level. The control signal can then be generated such that the gain associated with the sidetone generation circuit is adjusted to the particular gain level.
  • generating the sidetone signal in accordance with the estimated noise level can be independent of adjustments based on voice activity detection.
  • Operations of the process 400 also include generating an audio signal that represents, at least in part, the sidetone signals generated in accordance with the control signal (440).
  • the audio signal can be generated by an acoustic transducer or speaker of the headset, and combined with other audio signals (e.g. audio signals representing voices of speakers at a far end of a teleconference) being played back through the acoustic transducer.
  • a computer program product e.g., a computer program tangibly embodied in an information carrier, such as one or more non-transitory machine-readable media or storage device, for execution by, or to control the operation of, one or more data processing apparatus, e.g., a programmable processor, a DSP, a microcontroller, a computer, multiple computers, and/or programmable logic components.
  • data processing apparatus e.g., a programmable processor, a DSP, a microcontroller, a computer, multiple computers, and/or programmable logic components.
  • a computer program can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
  • a computer program can be deployed to be executed one or more processing devices at one site or distributed across multiple sites and interconnected by a network.
  • Actions associated with implementing all or part of the functions can be performed by one or more programmable processors or processing devices executing one or more computer programs to perform the functions of the processes described herein. All or part of the functions can be implemented as, special purpose logic circuitry, e.g., an FPGA and/or an ASIC (application-specific integrated circuit).
  • special purpose logic circuitry e.g., an FPGA and/or an ASIC (application-specific integrated circuit).
  • processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer.
  • a processor will receive instructions and data from a read-only memory or a random access memory or both.
  • Components of a computer include a processor for executing instructions and one or more memory devices for storing instructions and data.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computational Linguistics (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (14)

  1. Procédé (400) comprenant :
    la réception (410), au niveau d'un ou plusieurs dispositifs de traitement d'un casque d'écoute (100) qui comporte un circuit de génération d'effet local (205), d'un signal d'entrée représentant un son ambiant ;
    le fait de déterminer (420), par les un ou plusieurs dispositifs de traitement du casque d'écoute associés à un circuit de détection d'activité vocale, VAD, (220), qu'au moins une portion du signal d'entrée représente une activité vocale qui satisfait à une condition seuil ;
    en réponse au fait de déterminer que l'activité vocale dans le signal d'entrée satisfait à la condition seuil, la génération (430), par le VAD, d'un signal de commande configuré pour amener le circuit de génération d'effet local à générer des signaux d'effet local ; et
    la génération (440), par un transducteur acoustique (215) du casque d'écoute, d'un signal audio qui représente, au moins en partie, les signaux d'effet local générés conformément au signal de commande.
  2. Procédé (400) selon la revendication 1, dans lequel lorsque le fait de déterminer que l'activité vocale dans le signal d'entrée satisfait à la condition seuil mène à la détection d'une présence d'activité vocale dans le signal d'entrée, le signal de commande est configuré pour activer le circuit générateur d'effet local ou pour augmenter un gain d'une sortie du circuit générateur d'effet local.
  3. Procédé (400) selon la revendication 1 ou 2, dans lequel lorsque le fait de déterminer si l'activité vocale dans le signal d'entrée satisfait à la condition seuil mène à la détection d'une absence d'activité vocale dans le signal d'entrée, le signal de commande est configuré pour désactiver le circuit générateur d'effet local ou pour réduire un gain d'une sortie du circuit générateur d'effet local.
  4. Procédé (400) selon la revendication 1, dans lequel la génération du signal de commande comprend en outre :
    le fait de déterminer qu'un gain associé au circuit de génération d'effet local est en dessous d'un niveau cible ; et
    en réponse au fait de déterminer que le gain associé au circuit de génération d'effet local est en dessous du niveau cible, la génération du signal de commande, qui est configuré pour ajuster le gain associé au circuit de génération d'effet local à un niveau au-dessus du niveau cible.
  5. Procédé (400) selon la revendication 1, dans lequel la génération du signal de commande comprend en outre :
    le fait de déterminer que le circuit de génération d'effet local est désactivé ; et
    en réponse au fait de déterminer que le circuit de génération d'effet local est désactivé, la génération du signal de commande, qui est configuré pour activer le circuit de génération d'effet local.
  6. Procédé (400) selon la revendication 1, dans lequel la génération du signal de commande comprend en outre :
    le fait de déterminer qu'un gain associé au circuit de génération d'effet local est supérieur à un niveau cible ; et
    en réponse au fait de déterminer que le gain associé à la génération d'effet local est supérieur au niveau cible, la génération du signal de commande, qui est configuré pour empêcher le gain associé au circuit de génération d'effet local d'être réduit à un niveau inférieur au niveau cible.
  7. Procédé (400) selon la revendication 1, dans lequel le fait de déterminer que l'activité vocale dans le signal d'entrée satisfait à la condition seuil comprend le fait d'identifier, par les un ou plusieurs dispositifs de traitement, que l'activité vocale comprend une voix d'un utilisateur du casque d'écoute.
  8. Procédé (400) selon la revendication 1, dans lequel le signal de commande est configuré pour amener le circuit de génération d'effet local à générer des signaux d'effet local conformément à des limites prédéfinies.
  9. Procédé (400) selon la revendication 1, comprenant en outre :
    le fait de déterminer, par les un ou plusieurs dispositifs de traitement du casque d'écoute, que l'activité vocale dans le signal d'entrée ne satisfait pas à la condition seuil ; et
    en réponse au fait de déterminer que l'activité vocale dans le signal d'entrée ne satisfait pas à la condition seuil, la génération d'un second signal de commande configuré pour réduire un gain associé au circuit de génération d'effet local.
  10. Casque d'écoute (100) comprenant :
    au moins un microphone (210) ;
    un circuit de détection d'activité vocale, VAD (220) comprenant un ou plusieurs dispositifs de traitement, le circuit de détection d'activité vocale étant configuré pour :
    recevoir des échantillons numérisés d'un signal d'entrée représentant un son ambiant capturé par l'au moins un microphone,
    déterminer (420) qu'au moins une portion du signal d'entrée représente une activité vocale qui satisfait à une condition seuil, et
    en réponse au fait de déterminer que l'activité vocale dans le signal d'entrée satisfait à la condition seuil, générer (420) un signal de commande ;
    un circuit de génération d'effet local (205) configuré pour générer des signaux d'effet local en réponse à la réception du signal de commande généré par le VAD ; et
    un transducteur acoustique (215) configuré pour générer (440) un signal audio qui représente, au moins en partie, les signaux d'effet local.
  11. Casque d'écoute (100) selon la revendication 10, dans lequel la génération du signal de commande comprend en outre :
    le fait de déterminer qu'un gain associé au circuit de génération d'effet local est en dessous d'un niveau cible ; et
    en réponse au fait de déterminer que le gain associé au circuit de génération d'effet local est en dessous du niveau cible, la génération du signal de commande, qui est configuré pour ajuster le gain associé au circuit de génération d'effet local à un niveau au-dessus du niveau cible.
  12. Casque d'écoute (100) selon la revendication 10, dans lequel la génération du signal de commande comprend en outre :
    le fait de déterminer que le circuit de génération d'effet local est désactivé ; et
    en réponse au fait de déterminer que le circuit de génération d'effet local est désactivé, la génération du signal de commande, qui est configuré pour activer le circuit de génération d'effet local.
  13. Casque d'écoute (100) selon la revendication 10, dans lequel la génération du signal de commande comprend en outre :
    le fait de déterminer qu'un gain associé au circuit de génération d'effet local est supérieur à un niveau cible ; et
    en réponse au fait de déterminer que le gain associé au circuit de génération d'effet local est supérieur au niveau cible, la génération du signal de commande, qui est configuré pour empêcher le gain associé au circuit de génération d'effet local d'être réduit à un niveau inférieur au niveau cible.
  14. Casque d'écoute (100) selon la revendication 10, comprenant en outre :
    un estimateur de niveau de bruit (225) configuré pour :
    déterminer un niveau de bruit estimé dans le son ambiant, et
    générer un second signal de commande pour commander le circuit de génération d'effet local, le second signal de commande étant généré conformément au niveau de bruit estimé.
EP19722730.9A 2018-04-02 2019-03-29 Production d'effet local à réglage dynamique Active EP3777114B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/943,116 US10616676B2 (en) 2018-04-02 2018-04-02 Dynamically adjustable sidetone generation
PCT/US2019/024880 WO2019195107A1 (fr) 2018-04-02 2019-03-29 Production d'effet local à réglage dynamique

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EP3777114A1 EP3777114A1 (fr) 2021-02-17
EP3777114B1 true EP3777114B1 (fr) 2023-12-06

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EP3777114A1 (fr) 2021-02-17
US20190306608A1 (en) 2019-10-03
US10616676B2 (en) 2020-04-07

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